Delete a dead rationalizer transform

[SingleAccretion]

Seems to have been a workaround for an issue long gone.

Diffs: small TP wins, no code changes as expected.

[ghost]

Tagging subscribers to this area: @JulieLeeMSFT
See info in area-owners.md if you want to be subscribed.

Issue Details

---

Seems to have been a workaround for an issue long gone.

Author:	SingleAccretion
Assignees:	-
Labels:	area-CodeGen-coreclr, community-contribution
Milestone:	-

[SingleAccretion]

Failure in Libraries Test Run checked coreclr Linux arm64 Debug looks (once again) like #69657:

===========================================================================================================
/root/helix/work/workitem/e /root/helix/work/workitem/e
  Discovering: System.Text.RegularExpressions.Tests (method display = ClassAndMethod, method display options = None)
  Discovered:  System.Text.RegularExpressions.Tests (found 288 of 315 test cases)
  Starting:    System.Text.RegularExpressions.Tests (parallel test collections = on, max threads = 4)
./RunTests.sh: line 168:    24 Segmentation fault      (core dumped) "$RUNTIME_PATH/dotnet" exec --runtimeconfig System.Text.RegularExpressions.Tests.runtimeconfig.json --depsfile System.Text.RegularExpressions.Tests.deps.json xunit.console.dll System.Text.RegularExpressions.Tests.dll -xml testResults.xml -nologo -nocolor -notrait category=IgnoreForCI -notrait category=OuterLoop -notrait category=failing $RSP_FILE
/root/helix/work/workitem/e
----- end Sun May 29 10:53:55 UTC 2022 ----- exit code 139 ----------------------------------------------------------
exit code 139 means SIGSEGV Illegal memory access. Deref invalid pointer, overrunning buffer, stack overflow etc. Core dumped.

@dotnet/jit-contrib